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/*
* LIBOIL - Library of Optimized Inner Loops
* Copyright (c) 2003,2004 David A. Schleef <ds@schleef.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <liboil/liboilfunction.h>
#include <conv.h>
#ifdef HAVE_IEEE754_H
#include <ieee754.h>
static void conv_f32_u8_bitstuff(float *dst, int dest_stride, const uint8_t *src,
int src_stride, int n)
{
const float offset = -65536;
union ieee754_float id;
int i;
id.f = 0x1ffff;
for(i=0;i<n;i++){
id.ieee.mantissa = (*src<<7);
*dst = id.f + offset;
OIL_INCREMENT(dst, dest_stride);
OIL_INCREMENT(src, src_stride);
}
}
OIL_DEFINE_IMPL(conv_f32_u8_bitstuff, conv_f32_u8);
static void conv_f32_s8_bitstuff(float *dst, int dest_stride, const int8_t *src,
int src_stride, int n)
{
const float offset = -384;
union ieee754_float id;
int i;
id.f = 0x1ff;
for(i=0;i<n;i++){
id.ieee.mantissa = ((*src^0x80)<<15);
*dst = id.f + offset;
OIL_INCREMENT(dst, dest_stride);
OIL_INCREMENT(src, src_stride);
}
}
OIL_DEFINE_IMPL(conv_f32_s8_bitstuff, conv_f32_s8);
static void conv_f32_u16_bitstuff(float *dst, int dest_stride, const uint16_t *src,
int src_stride, int n)
{
const float offset = -65536;
union ieee754_float id;
int i;
id.f = 0x1ffff;
for(i=0;i<n;i++){
id.ieee.mantissa = (*src<<7);
*dst = id.f + offset;
OIL_INCREMENT(dst, dest_stride);
OIL_INCREMENT(src, src_stride);
}
}
OIL_DEFINE_IMPL(conv_f32_u16_bitstuff, conv_f32_u16);
#ifdef ENABLE_BROKEN_IMPLS
/* This is intermittently broken on powerpc for unknown reasons */
static void conv_f32_s16_bitstuff(float *dst, int dest_stride, const int16_t *src,
int src_stride, int n)
{
const float offset = -98304;
union ieee754_float id;
int i;
id.f = 0x1ffff;
for(i=0;i<n;i++){
id.ieee.mantissa = ((*src^0x8000)<<7);
*dst = id.f + offset;
OIL_INCREMENT(dst, dest_stride);
OIL_INCREMENT(src, src_stride);
}
}
OIL_DEFINE_IMPL(conv_f32_s16_bitstuff, conv_f32_s16);
#endif
#define signbit_S32(x) (((uint32_t)(x))>>31)
#if 0
/* broken */
/* This implementation is slightly inaccurate */
static void conv_s16_f32_bitstuff(int16_t *dst, int dest_stride, const float *src,
int src_stride, int n)
{
const float offset = 98304.5;
union ieee754_double id;
int i;
int16_t d;
for(i=0;i<n;i++){
id.d = offset + *src;
d = 0x8000 | (id.ieee.mantissa0 >> 4);
d += (-32768-d)*signbit_S32(id.ieee.exponent-1039);
d += (32767-d)*signbit_S32(1039-id.ieee.exponent);
*dst = d;
OIL_INCREMENT(dst, dest_stride);
OIL_INCREMENT(src, src_stride);
}
}
OIL_DEFINE_IMPL(conv_s16_f32_bitstuff, conv_s16_f32);
#endif
#if 0
static void conv_f64_u8_bitstuff(float *dst, int dest_stride, const uint8_t *src,
int src_stride, int n)
{
const float offset = -65536;
union ieee754_float id;
int i;
id.f = 0x1ffff;
for(i=0;i<n;i++){
id.ieee.mantissa = (*src<<7);
*dst = id.f + offset;
OIL_INCREMENT(dst, dest_stride);
OIL_INCREMENT(src, src_stride);
}
}
OIL_DEFINE_IMPL(conv_f64_u8_bitstuff, conv_f64_u8);
static void conv_f64_s8_bitstuff(float *dst, int dest_stride, const int8_t *src,
int src_stride, int n)
{
const float offset = -384;
union ieee754_float id;
int i;
id.f = 0x1ff;
for(i=0;i<n;i++){
id.ieee.mantissa = ((*src^0x80)<<15);
*dst = id.f + offset;
OIL_INCREMENT(dst, dest_stride);
OIL_INCREMENT(src, src_stride);
}
}
OIL_DEFINE_IMPL(conv_f64_s8_bitstuff, conv_f64_s8);
static void conv_f64_u16_bitstuff(float *dst, int dest_stride, const uint16_t *src,
int src_stride, int n)
{
const float offset = -65536;
union ieee754_float id;
int i;
id.f = 0x1ffff;
for(i=0;i<n;i++){
id.ieee.mantissa = (*src<<7);
*dst = id.f + offset;
OIL_INCREMENT(dst, dest_stride);
OIL_INCREMENT(src, src_stride);
}
}
OIL_DEFINE_IMPL(conv_f64_u16_bitstuff, conv_f64_u16);
static void conv_f64_s16_bitstuff(float *dst, int dest_stride, const int16_t *src,
int src_stride, int n)
{
const float offset = -98304;
union ieee754_float id;
int i;
id.f = 0x1ffff;
for(i=0;i<n;i++){
id.ieee.mantissa = ((*src^0x8000)<<7);
*dst = id.f + offset;
OIL_INCREMENT(dst, dest_stride);
OIL_INCREMENT(src, src_stride);
}
}
OIL_DEFINE_IMPL(conv_f64_s16_bitstuff, conv_f64_s16);
#endif
#if 0
/* broken */
/* This implementation is slightly inaccurate */
static void conv_s16_f64_bitstuff(int16_t *dst, int dest_stride, const float *src,
int src_stride, int n)
{
const float offset = 98304.5;
union ieee754_double id;
int i;
int16_t d;
for(i=0;i<n;i++){
id.d = offset + *src;
d = 0x8000 ^ (id.ieee.mantissa0 >> 4);
d += (-32768-d)*signbit_S32(id.ieee.exponent-1039);
d += (32767-d)*signbit_S32(1039-id.ieee.exponent);
#if 0
/* for clipping */
if (id.ieee.exponent < 1039) {
d = -32768;
}
if (id.ieee.exponent > 1039) {
d = 32767;
}
#endif
*dst = d;
OIL_INCREMENT (dst, dest_stride);
OIL_INCREMENT (src, src_stride);
}
}
OIL_DEFINE_IMPL(conv_s16_f64_bitstuff, conv_s16_f64);
#endif
#endif
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